It looks like the changeset ca78c974e938 broke the "x86 XP-4 3.x" buildbot:
buildbot.python.org/all/builders/x86 XP-4 3.x/builds/8795/

Traceback (most recent call last):
  File "../lib/test/regrtest.py", line 1305, in runtest_inner
    test_runner()
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\test\test_tools.py", line 459, in test_main
    support.run_unittest(*[obj for obj in globals().values()
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\test\support.py", line 1600, in run_unittest
    _run_suite(suite)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\test\support.py", line 1566, in _run_suite
    result = runner.run(suite)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\unittest\runner.py", line 175, in run
    result.printErrors()
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\unittest\runner.py", line 109, in printErrors
    self.printErrorList('ERROR', self.errors)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\unittest\runner.py", line 117, in printErrorList
    self.stream.writeln("%s" % err)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\unittest\runner.py", line 25, in writeln
    self.write(arg)
MemoryError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "../lib/test/regrtest.py", line 1615, in <module>
    main_in_temp_cwd()
  File "../lib/test/regrtest.py", line 1590, in main_in_temp_cwd
    main()
  File "../lib/test/regrtest.py", line 796, in main
    match_tests=match_tests)
  File "../lib/test/regrtest.py", line 998, in runtest
    debug, display_failure=False)
  File "../lib/test/regrtest.py", line 1330, in runtest_inner
    msg = traceback.format_exc()
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\traceback.py", line 254, in format_exc
    return "".join(format_exception(*sys.exc_info(), limit=limit, chain=chain))
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\traceback.py", line 180, in format_exception
    return list(_format_exception_iter(etype, value, tb, limit, chain))
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\traceback.py", line 152, in _format_exception_iter
    yield from _format_list_iter(_extract_tb_iter(tb, limit=limit))
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\traceback.py", line 17, in _format_list_iter
    for filename, lineno, name, line in extracted_list:
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\traceback.py", line 64, in _extract_tb_or_stack_iter
    line = linecache.getline(filename, lineno, f.f_globals)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\linecache.py", line 15, in getline
    lines = getlines(filename, module_globals)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\linecache.py", line 41, in getlines
    return updatecache(filename, module_globals)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\linecache.py", line 127, in updatecache
    lines = fp.readlines()
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows\build\lib\codecs.py", line 301, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
MemoryError